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...at cell should get a missing value, NA, put into it. Also, could the gridded result for each time be written to a text file before processing the next time value? Hope this is clear. Thanks in advance. dxc13 -- View this message in context: http://www.nabble.com/gridding-values-in-a-data-frame-tp23319190p23319190.html Sent from the R help mailing list archive at Nabble.com.